Date: Thu, 18 Jul 1996 23:04:02 +0200 (MET DST) From: Wilko Bulte <wilko@yedi.iaf.nl> To: y0002257@ws.rz.tu-bs.de (Sven Brandenburg) Cc: freebsd-scsi@freebsd.org Subject: Re: turning off scsi disks Message-ID: <199607182104.XAA02887@yedi.iaf.nl> In-Reply-To: <9607181717.AA79038@rzrtr1.rz.tu-bs.de> from "Sven Brandenburg" at Jul 18, 96 07:17:48 pm
next in thread | previous in thread | raw e-mail | index | archive | help
As Sven Brandenburg wrote... > I hope this isn't FAQ or already in progress - > but I wonder whether it is possible to turn off a scsi harddisk > automatically after a certain time of no operation - recent ide drives can > handle this. > > I know, *SOME* older scsi drives knew a vendor specific command which performed > the same - but I tried this with my (newer) harddisks and it didn4t work :-( > > My question is: > Can someone help me to find out the *RIGHT* scsi commands for my disks > or START/STOP unit should do it. > I suppose turning off a scsi harddisk with the scsi(8) command and START/STOPUNIT > crashes the whole system rather than reducing noise ;-) You better be a bit careful with this. The very nice MTBF figures we see these days are definitely not spec'ed by a system turning the drive on/off every couple of minutes. At least not if the drive was not designed for this. E.g. laptop drives even have 'parking ramps' to lay their heads to rest ;-) Wilko _ ____________________________________________________________________ | / o / / _ Wilko Bulte email: wilko@yedi.iaf.nl |/|/ / / /( (_) Private FreeBSD site - Arnhem - The Netherlands --------------------------------------------------------------------------
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199607182104.XAA02887>